SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b858716d86796616d12ca639e00594406768c7ea8fd1872a4b5ebabbfe3394c' 
  AND token = 'i0DJ7WbCTVk9PuGv867wybgSHYs1KhdzOUqcRdU5fvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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