SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3700b1d2a0429c2669ebf8de0735e862df5fba1d1c9403e67daf57d188c5510' 
  AND token = 'hGvbixjFMhaCbCgzHQ9g2WKLW4r+O6ZTTkZU82uXzoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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