Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b89b448576d4201c72470490cbc3ee8b0353dc94d3bb3143a7572f5c517f3a51' 
  AND token = 'FFSY2hHsViK2mwW3zUtcoqeruWo0FrXvgdT0MrsaZmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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