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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9258df9b9cd38820b2d9d11447f688b241db4d0ca64fe34be422a27daab2edeb' 
  AND token = '+RhKxiNTfqlHBYAIkHDIlgV7r7VII+zA+NKLH1gDj18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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