SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c06a3c4e2bb5dc7904ff28353002fdc1d8c8ce7857d344cf736725d9715e311' 
  AND token = 'kwHhFYUTiLVkbZyKXWtIlCD9dKNbMoY7Gppzk3VAaeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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