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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b6cc49594271a1fe88b9e909b99de127167bdaea634c60851520ae3ffd71698' 
  AND token = 'saeU2Z1qYfKCT8CjAj5JCod6LsFaFj5zReZg9AUUwx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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