Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2052f4fcedcc211ac1df981e2d25e1e82f0b3336bdae72d3a505eec7f80d9903' 
  AND token = '0NUgOZyucf8mvr8VH9mZewtUtO5to/gmR6yxz10KClU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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