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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6cf0fb0babf7e80cc10056f3def8160618d8cb709408de80ee920a30d081128' 
  AND token = 'zH440cZwmaqYjgddb4DBUi90opiWWK7Fdxf15DoFUEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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