SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7005d031c95a3a640fe75b9b8274ba12565e5b2fd275ad3e0bf3232a54ae6b5' 
  AND token = 'W6+Zl2aW4JYZv1FXg39FjycK38nS/zJ3mXQCqLqd2jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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