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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e8fdc52e91a8ae393e3ceeb82330bc7c5bd02e9c06bb8cf136ae677feecd328' 
  AND token = 'rLPNMvWLKjRuHrxenHW+/SGLNNNpU0asmGIPu77rf6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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