SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5713c9f47f55158680a64becbd4eac2913ec28ac141bea6eb480958cc6ff3e3d' 
  AND token = 'rbQt0hJmZ2owqFkMfnGBGuZjJ4fN7/vjFl86aQ3ScWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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