SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65ddbd27b00338fc94d27fb3b97d15ae8a5ce00a0fa4be1fb5eefd6a75b13314' 
  AND token = 'VFldl2GjMEu9xiPwJttLnm/Y9sOAsHTXgP+Y0RC5OpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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