Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e525329d6b72ed9390f29f1ecef9ae41bb19a1fe40d3b5758a73a7bd9a996b65' 
  AND token = 'C/Iw8HElsTiB9tfKnSVcvglcY8A6AD1niBfSBoT81ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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