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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '296b39fdf2082cfbb6d463755dedbe9938a28e1dd6662d603cc53d0f1cec3a76' 
  AND token = '8SKVw8pdi0v2sICmpp47eQn0MYF0lnHbeOW79GV5tLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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