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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fdf38e0558ec054cef3055c50d045515a89adde16bbce7093972561d38c533e' 
  AND token = 'ZrAhNFwu1IhBAjjOZKIgy4srQkIwvFNz6eR0eOuQc9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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