SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f814ecb4b95785c655284321b41e43ba48d4e116ef7b3d0c0a3f069c113dae' 
  AND token = 'PbwduIdLHIzF6PnAucNvqn+WJSugNQQ+MB1T3PqOSmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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