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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c72ad15687746613726120a3d114201970523241e233e8228b3dd59d129ab41c' 
  AND token = 'wLohocU7FHojEVOH9jApjl9q6VbQcXUE5eIyt0dUvuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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