SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b60bdb2111622c040354b17794e9b85fd7fcd65621675c99f45e3365fcf7f176' 
  AND token = 'V4FSjYoPaxC/e2Ab8TrPgpvxyjvCmFIyiOHc1EYhwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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