SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be2a8da6593664ba9461edb22b65f2f8674eec34ea261ec224357c8c26c48005' 
  AND token = 'M/+LGR+0ALfjw0B2DoOQJucHjfKjMuZxs1oeUy46hHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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