SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d849231d0129dd6ad37a8aece7bde1986e42b8394777fdec32633bedcdff36a' 
  AND token = 'bGFhScH1BDmhBpq2shFm4X5Gv9lg39WCuHgx1qWxHJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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