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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2391bc832c996e70e3892befa40d73634242bf333799f751f06b31c6f291eb39' 
  AND token = 'vAy7eb24Oy1lQvYRv0i6+CtKWdFirSu0r7Q6u3MyFdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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