Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14b49ae2b1b6c51b062bd07a2049621111902db9d9f70fb2dc9278f8cbd251cd' 
  AND token = 'PrztoMjGoEbya2ZT3Kf/odI2Z92dpmX9bNemXr05Icc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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