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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91795272dd8caf2b93e1635f515d634f1f37af3ab047d8c63d86fbe5b1acf9e2' 
  AND token = 'bEO3UFSlAjwA7/JM2uI907wSUpN2eWbyi9KCEclI3yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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