SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83299c9f960aaa259ce7d34913718ab5dddf9fc3fd9d450478cb2a57585050c6' 
  AND token = 'i/+gCqZ0IGfiJu0ppbTmNE2rjmRPrkhwr7fR1Ik1D6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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