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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '092f511468cfd3273b4ffb68e8ae9bafd6fcc8c9929c588355bb29f4588e7936' 
  AND token = 'HeukDkKk+3KFIFG4KFsrBE9ab1JDp9YMNw9W48dhC58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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