SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd960a091c2aabbb743928fa2047bc99462d10ec09d14c3138035b91ffd7b8241' 
  AND token = 'JGEpgKsJp7mZN0nUNQCbZAqpfZ6S/8TJHZ7+zOEiGRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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