Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3441e794cc681e7eef330aa832d75adfc7a66b480b3e7246097213c18efdbbb3' 
  AND token = 'JVGzcIkzN6Fqk4AlTOoQgJlWT3EjYl4ZtrdMVNOrhEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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