SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7916b7c6e2acc85e248e5784aa4d8e1e0239f74de4f27064d5633c40354ac070' 
  AND token = 'bP/IqvT4mwYIRQojVznohsRt3P99iLCHlzNcb4r8xJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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