SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6046ad2edafc959181a99cdcc90cddbb6a7a056c52f17b8c386a0bd7e9b15362' 
  AND token = 'LArIBlswGXGqPLFHmCKp2/nHLKW5d3CAzhDOgFan3Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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