SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc39881e1edc1d191d4c398336d4774956712599e3fc4a121555d546f932ce41' 
  AND token = 'LWY+epUPb0Tz++86RLUQTiRxvLnJ7Kpm8BKTFjIzymY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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