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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb40c74353bd2d11ce3eb8f4c331ec9fbe9c71a9c117ec9d797a3eb53bb840b' 
  AND token = 'k66pa/K37u58oiNyQmNWQ1lyC99pfb4QSN0F7bjyYsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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