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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12a04ab02a76e8f627cc3f9df4ddc6f18542bc02fb744b2c857c9db8945ee61d' 
  AND token = '4eykzV9DYnUCZW0tbbCaBQlaiNR0aY0WjAjhYfCWn5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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