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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bd38da189c9d3e65d98ce8e209e5f9bcccf033cc083bb73558beaa9daf07b8e' 
  AND token = 'zYbI6Jp4+RK5z73GGVrCHh9pEwUiDf8TI0tbh8MM5Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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