SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '115f90ee08274c8b215e279faadc0f661dc21b7dbeb3b1c2b536d4193e3538a9' 
  AND token = 'jIhTldjAseoKumZ/ZBrzPteufaoFGPLy1sB/+cwDwoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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