SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a25ea9e55db49b442384ee10bf29821607414eee067848e7d0dc6dd77abb130' 
  AND token = '3v93ziLOIpAeK7PLg1wFFoJR/wjSx1FOZLTBVhZenvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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