SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1275cc302a50ddf80832ac2b9c38045c6874499dbfd144e6b09f633e22b83ef' 
  AND token = '7fAQm10/4hF0xK54DErNaSO7W3YBrgVzk3JufJZ5qRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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