If the keys are distinct over the hashes, the question is why to store them in an array. 
my %hash = ( k0 => 'c0',
             k1 => 'v1',
             k2 => 'v2',
             k3 => 'v3',
           );
my $search = 'k2';
my $val = $hash{$search};

[download]

Even if the keys aren't unique, you might want to store the data in a HoA instead: 

my %hash = ( k0 => ['c0'],
             k1 => ['v1'],
             k2 => ['v2', 'v42'],
             k3 => ['v3'],
           );
my $search = 'k2';
my @vals = @{ $hash{$search} };

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: extracting elements by key from an array of hashes by choroba
in thread extracting elements by key from an array of hashes by ciderpunx

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