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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '499700e276a9a5c4b2483efd647b9c441c04575bdc35699da176bf2ec5682830' 
  AND token = 'DzWEBZrkReBsm6NkQ1H+gBN8tzo7e8VGFzBaENn7l6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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