SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fba6f7b152550b52e96e3283ccdf32f699f4567a84db0026364fcc3bfb5266a7' 
  AND token = 'gBxD7E9qwBV1GXkcu15J4cvVkOgWIFWLZp+uT0pP3Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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