SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519f8d8b3578e99d58c17044c088bdf7f371282fadf7be41c48a93391cf6620f' 
  AND token = 'wDQQhE3lj/jB1gTI7/7Vc0/S6j/LIMyQyUTpFKsjtnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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