SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2762f52feaf133d09226a1d88902bcf65cf4e4c19cd436d5c36bb57009f562ed' 
  AND token = 'wPK49HFLPPGCXj3s6Fnb05Gny/K+wM4HXqDROIA5Lk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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