SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aa9043c69557e05d3922b5c81e27343467b691274a448ba3afb91791f8b51fb' 
  AND token = 'ijKzcH17SRGH0OGYF4zqLgUemi1mojRp+tYLJSayuHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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