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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06d15dede883981b17daf715312239d5725719fb0d0727392709919fef4e35b3' 
  AND token = 'ZjM8P5HfLPXprvhNi6cp9e7F9uwfuFmRXPCxqEbs70M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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