SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2643b98d47836a726104027f259fd96e53d31fe6710371f8b8c7cb44761c48ca' 
  AND token = '9B4LIcOXm5QhCclb9N5uULYG8WyBd4iyee9mQ/qjHZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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