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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f46ef1413f93b8b4b5e41882ee873a09f77a05e9ffb41ba0744e9736ebaf36c' 
  AND token = 'w/WWgJEoD3gJbj6i5VzncN8OGQbkwgrS0i0OGgJRj9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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