SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ecd5d53ccdeffbd3017caf4acdd123fe11ab63f368d95f7c2364b151ac72a7c' 
  AND token = 'rDJGajPW79KebYG/E/m8KGZWYCS7m/AYugd42gNuhVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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