SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fce97a146c131be28999eff9fd631a248d9f9727c31245b4e6e478d2ff571dd' 
  AND token = 'I0esPp+axwDt1jFJzvB7u4qYcnxC8Dhp0pUR4sNUocA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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