SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32011d994801957070d0e11435d9b29eb2cb875db6923d8d3e051fdd7aa281ff' 
  AND token = 'poORXuGWfiXWKFKzZeYAPhm3zAQmHCDK8q73VsBxysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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