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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c95ad36f6ab70d91c9cf15f6fd7a4d70deed352d4bf331b81d5a8b1c3bcf2719' 
  AND token = 'n/Du/1vwDdco0r2ZFqjD7N3l7Y5lkR4bOisaR9Yg9VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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