SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23fa34b0ddb4c73466f1667ac57c97444453ab2171de65894717f3331af1f80d' 
  AND token = 'vvHb0xWMPurfHHrlxuiJSi/pcSQxTzy+Izk/VKOB63A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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