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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b830df283f62378ce213a10c012189be4d8cfd647b7da83693815e1e75e3c7b' 
  AND token = '9RWcN9Y/2jc44TnxKAAr1kvyJ/Iz0zJxiXkbYds1Sgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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