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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4eaf460496d84b31d1b4ec914a3dd177d64ee67e611a03e12f7e1613c610077' 
  AND token = 'dRAyhXzJe0J8mz5xiaVRVtr7DAv5lChqUYJeq6BdTEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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