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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac65151f445f36d1d8fdbbc8378ff6e258d2de2df770018ade5570dc772ba271' 
  AND token = 'qPneSnGnYhwfv7fXTqSggwyc3fucIb0/pnEPWLw2exs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}