SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06d9e510039c6542b6441bc6eb98a1ef94f50d45d86dfbae3099c567ce376c0c' 
  AND token = 'P3jrM742KnRfDvC5sfQw9Gciji+nwRlVR+/AKza2L4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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