SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045154a6132ace5120688b7a243858fb1ce088f49294c8e63e7ffbfda7fcf6c0' 
  AND token = 'iV51R3+TbVoZG5Xo/pYQhWBucVxoF4NL/iRUngOovrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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