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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b691dc937255b89d7a117a79a80a10544b92d12cda779311007d810e82c9b745' 
  AND token = 'd4bRXupz31UVf5U9kUvfqdntnIEWeNlZWWNTphV6SxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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