SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23d57c725242f687f4f401925ffbb4fae2d782e766ceb1bc534746b041a5341a' 
  AND token = 'XqNSw3zLJmFms30ddQSFgSplZYNvRxCW+hLCYCYhqUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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