SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b5beaaf2fa52985d9b2c5dae65de32021560adca31dc73914ac48d4c47b6d1' 
  AND token = 'KEJt6+tNqEPSVmliZZ07ZsKx7vNjUX82Jj1mBPdYrlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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