SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6894d14668e7f507c8f9c9395bc923012cf5a320844b5f74367cd85457898bd7' 
  AND token = 'QWdhVt6IOIyTHMjF1dX+mlJzHR2jzT90IGRfo1s/WHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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