Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54259a8cbdefc1f5d27cc99d59eb1aede892c0a4f321f78abc1cdd0dbc5a9aa8' 
  AND token = 'FvwTZy/LCJyL3VTgZtEJ6QFC6mW2w6a1o3XsLGARSwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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