SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03f623ae5638d3257fa7913b65725544d64bd8c9136fb70972442bd8408e0c80' 
  AND token = 'dCGvIYj0Gz+sOM2nZRHys/OChNykI8OvW8vV7wEfHy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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