SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '748e2d2b464640532549db96fd06dc5f8b282e1c924dcb76a8d8de410333524e' 
  AND token = 'paC1BzXcnQwFVDQPfo9x/f2BzBkPU8eVvp7r1FijCF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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