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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd378633d42a5b7caa744841fd08846e4c964e36e9fbc295458ea628aa1a399fb' 
  AND token = '/T5khe0Y9msmPKqZgtx7kDcDAs3db9brb6l2APclS5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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