SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15436a41dae33133dda407e2d50ac1b94f974767c70fee37cc3ff4717668e578' 
  AND token = 'vN8YoAYDmj9MmkmxJJFfVP5Hdv0ik1kO9KD0gzXzLww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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