SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01a04268b27e7f749fc01dcd2fcd476705577757fe5886dd94819eb23d2ea681' 
  AND token = 'wvTESz2eIZlF9Sg/ugNeBRrd+QqQpOK9vWGQrzumMW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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