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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d7d484723b1b242c58987a6589218a53b6812056f964b8c453121e8705ccf55' 
  AND token = 'r/iIc2p5EYklLcwUaUciWlyetp4Zr8xVQvhl/V/rwcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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