SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb9fe35184c66d632870f811719508180bac1329946a150f39864d432bd6e67' 
  AND token = 'WwTAvpG8im4SByL7O6Vx4V6+Px+h9ms31JpXarVf/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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