SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b384e567001a32988dca61dce5acaa4a09b38efe8d1a52b0162d8db24c3d473' 
  AND token = 'DJDvguhu2gD6uUFmtRW7kE05OVL9suaNKXpmqGsQfjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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