SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6482ce22024414a36501fbed3782223536879980ca4b8b48bfc2b5ffe46bfe11' 
  AND token = 'quBOYUMMUxLQvX/lMMfY7lwUZGXG9SWN+VrxDxFlowM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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