SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '507e52e02ef938d5d365a3028b4acd68557c816148a6b2a818cfb9e6b8033447' 
  AND token = 'JHAGbVn0f6eEhLV3BY/9VL6q5ruuHjJqB8OVoN1CAFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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