SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd696548716b906889d04da2783b38633c29220f9f721318d8ab629f2bb6a2c45' 
  AND token = 'RSKnfLWCAqUfeXY/AAirucPzRJTj/wsFE3VGVrMK9HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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