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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8dcd4e8247316bec2bd3e7db79497b88d67b5ec3a2b975bb160cf5ce65c35c4' 
  AND token = '96xiYFSjL6MFoVyKM9gxTe/h0t2GSgAS7jqW1ptodC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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